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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f5950c8b8eb093d8a599ba522e7bd3dd8da642cf73ab1c8cf060dd0d483443' 
  AND token = 'ifHsHtzOAE6TXW+5Y7YcD62dA3tBaKZrTNvG3Qm8COQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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