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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b4748f5cd5bdb0108a7b9eba41b7d8cb3e242d94be31eb247423f91b8da96b' 
  AND token = 'Vef62Uz9V+gXL8sBkokCrPRU/N8C1skW/wXxgM36aE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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