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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a21d4f3f9976c278793d65afc442683b1f31d3a3a277c1dd422ad7df98e26a' 
  AND token = '8quLv7GV22v8uNnb7OqmJ2rF3Ai89eTzXfeba5ORP4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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