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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76d6d18fd988c61ab2ff990aae32f2f75fd00f95941bab7d7e2e2c64c48f1d3' 
  AND token = 'Uyr4LYsYFuFRi2L+L9gsYFk9XIyHU+Rt/TJUhoAVgAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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