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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e7575836c83c0de2d8b47d1a5f1f20ca1755750af90ce2385ca9eae11bffaf' 
  AND token = 'qdodNp+j0Xptb1x1melu7tlGQrCElxmnEznFmWby+b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}