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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223724c123ac798c99ac2401c1e663323408923d0a2ba369456c8c063398b6ba' 
  AND token = 'PcEPZslmEB2OmkwkD3fNIIORkW5Lrx3rcelKjxOy7eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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