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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6700b52c4f6aa6dad1a13c2280158a2e613362a4875787275ad275a108edbf7' 
  AND token = '4K3AJGA2LDGGKAY0UJag1R/tmbp+6YzqiG2w2/48VJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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