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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a9c04f1b4455f7053d02b606ea8614f99f2a98a1eb6fd92510b98431ceac3c' 
  AND token = 'VvSN4gcyoLMkdOMT2SRWKcTyfa2CirxHBmojRZ100vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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