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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b9d94e764b23c2b2d078c8f17342ec26f97c44a53c7bddef7990a94a7fa197' 
  AND token = 'Iv9jnwpI3FxFV9HsoAprhK0NC824lITQIDdoPbguYBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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