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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076abe2fac8b24bfd82f4484e7b0585d7951778666e54ee55bed1147304edcfb' 
  AND token = 'C3tfGtetIKaytG2DxsZ038hHpC0tFYRdhjI0WcwjpqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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