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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e6620ec8a1ee66503611139544600cb0581989f143e7375efba2e8aec0ddb' 
  AND token = 'YXy45+oYO3rxvqiSoiIbjz634yuf2Dixi/OfmgpC4fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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