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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e094308d2399e2aa0e7652b9151db63fb04ad5ce1d2b53252cc158becb5e15' 
  AND token = 'Bja5ujI0hi4XXS3499P80RG5xrcrx5XKTmXH5N6jbM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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