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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb76ed5167daf54cfd1900bf6556a847a8626d90aa6c1c6b14c5698b607f0a5b' 
  AND token = '8hj27WNFf2N/Sy7OtkAwpXGLdPPlLTyZ7I7OOb4m4Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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