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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8102dcbe996d67c5d4fe10c3478224e7c6aa8a31271abd5413b9d57550eb36e6' 
  AND token = 'FmP0/Qm4Byf0iXx2uE234rozCtfVnxJaOUu2FC3pBxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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