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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028eb1f5f0a7bbc0133958855af8ffba6645488b3308792eb6d5f2991747a1d7' 
  AND token = 'd3x2/69EdzwkLs1eOrv8nW0ueTaekMjIheIBXnX7Sq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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