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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a9269d86f9e59cbfe77174322c1cd20773065f829e4e0e5c171ca6e458a2c9' 
  AND token = 'jjW1KgRLESu0Gi80FmvZYw0Hsfttudi4cbGPldf+Fqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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