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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8786b48bf6ebf6dd53ac6cdbf1cbfe015d89a75c511eb994c150f2b9e26e25' 
  AND token = 'jsVrI1Sm2ESn6XhOGoHxtp0xYu+jql3e/NfmhxlDsJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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