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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb0b00b4868415e04bbc02214a8c1654427af25f2e45706c843f2d1383160db' 
  AND token = 'DTgY+AqSiFIWYrGvH7Vzp7eos4fWylyMtqbYVVNQe1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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