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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3f40a9b29c2d8d9359027717702b1c3a9abe617240ebb4addf78f1e438bb1b' 
  AND token = 'PEhL/oItOJAy1u1apFeS6oIpslxzBDMdPSM+Tx2E3eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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