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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113e5161d894365b16afc93a5804f3a4daee81d86de0a25c54c8fa9cef6bb230' 
  AND token = 'kNTlZtH0mfSU3nxLdlAJoRU7/OASAniq93mibw6HKZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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