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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908293152b0782c344602ad47b6caecb0120da67bfbe97601e3738403fac8f21' 
  AND token = 'F0TJi4jIk/iZ0R40tWt7S65XOGPT+4wiTJe/0B0tFbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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