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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba0cd1d400264fd9530b1c34efe9e96404ee44494442f9a85410a72e7677643' 
  AND token = '84mfFO2JrGapfWHbTvGbDJSomyBf9F1IA0ZYC4SgeR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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