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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92acddd36f751eb16103f5c2bfca4cf5370dcd06f5002d466ae0425d42359e3' 
  AND token = '73lH5wc3JcCj0SxYJ7ojwVzx2CPJnoFjTh5WG3oi0Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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