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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812873e7bc70a136df4a62b728ac88640ebf73c88c43d5cbee602e22be633344' 
  AND token = '4uXEGnlOKh80JLdZSiQdN9xkdE2hrrrFRGjpC3lqqt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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