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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b15cae63128f5c5d25309497cc7cb588cd75e61084ac688f04b990982ab2aa1' 
  AND token = 'AzgsTA61zapBwW2tJc77Q10SB/HvBvS/5ZRw3kK/wV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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