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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36eb0f1905d936e302511059ed377e1f4cbb4adf1df10f5c107f1c23d70cd7f3' 
  AND token = 'HvOGXAMPHH+8UnptPX0G0VyHwjgKLOIXf4t3FyUaotk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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