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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9695801dabac6f7c0ec9574dd7cb6048f2b00bc1ad56083e5adea08ac3f670f4' 
  AND token = '1tArW7EIErGRpDOVPkKsLNSr5Xb7xe9gWbvENF3VO14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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