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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7999f7c36f99dbdcdc67e3e60f91f2f8f4047107f1af6053b625bc165f72895' 
  AND token = 'waQ6o895Lk/2qAOvlm4m1P5wcsc9HTWWjjUceLVJiZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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