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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6e26ec5492e12d8b6f79f547644dc6e374abd381e3ca832f69bd64c459396e' 
  AND token = '9ZbMyW+PV1tRYHAkzch/5clMm7CXWOuNI8iAX3g2nkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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