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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1edc6fbb4d0b2135bf7f3daa2baade0a0033de6a8d13eb996f76d8c6ae8593' 
  AND token = 'kearnAlOmFMn5kpag1aX4QcVMANt5q0cqUCcQIu9mWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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