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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6a4ff3b422f45e3e558c58cae8248c9333a0fae3840032f501d7aa69f0db68' 
  AND token = 'aWzflq++NcKkSh5Fhc/w7sFbwpbEREs0WzOOCNmtka0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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