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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda257cd8d7c8ac8f2e72a27ca3def5ca9d39e19535859d6a978420bf5f00fb9' 
  AND token = 'ImySdzZAuGVndOvQcguy2+f7BURlbxH8ctI/I/0aVxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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