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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e080406cb54e959ce19422e68a6b4b4edde68ecd92886d5106d6aab6df53831' 
  AND token = 'E/U2IyaXDdxH6Wn7nn4/NS1oe25pDcNH+9vmCpVndNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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