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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff1fab2a05c40e8bfccaa7734a2e9b4081551e4a1f78bf7b37a2e764ee8529c' 
  AND token = 'j/3CFVIY1CWdgJBFEVqrs72JRF2IAIK89/70+dP54HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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