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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281ce371c72e6f88770aaeb73901a5d359d3cb3f501961d42095c21891c3e94b' 
  AND token = '2C4OI963ldGQ+bpoj3jc8SypYaKpC4H2v4v9DT+mVTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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