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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30753c786900e8dea7047db3273e89fe19b322a77d198fc8cbb631514f25469' 
  AND token = '7XCjny/O0PsrvjP/Q+6RW2m1IdAR6vlv+Yy10C9+w50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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