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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09da78b1ef84c7da09934997d15ad4f394130a05a706a89f7e5d02b3a22afae' 
  AND token = 'h6GeUfKD9eZgYJ6xy838pH0OmXJ2lyvydK9636jngX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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