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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0174572b78853e7c5219e8e78aeec2c3dff345a422a95e029ee8cb862fc01e3c' 
  AND token = '8hL5+NzraVlmvYvjH8i4I3IMSXfxy5vqc/oMhkSU9d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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