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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8537c5af0b8297e5f5433331d4dcab345c8fb9f52500a1ebcb679e6dc62d92e' 
  AND token = 'gFkqrHLL3uBSs1q74A2+tGsnF/2rxHB80XN9rRdzeo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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