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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1243daa124fe0010f974aea50f313519bdcbcb5d7d8ff5593d0bf8e236e75b9f' 
  AND token = 'Ea62BvQOl7gPL4NCXprpyPsEnhfalDtalVfuNRTVfmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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