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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9897d0501fdad947759d19ec0f8296e769be88b4499b816dddf9cd56a348940' 
  AND token = 'K556ZFX/XX0aSV9HrifCS+sPRBPp3iD5fmrK1k7eZOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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