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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc569900083ed5d612cfc01310278c7f8d095566ee4ddcca1bd6246afb2a7a0' 
  AND token = 'UBUMbh9FCfYIL3QNddypn1ed8kXdNZ5C0cKe8wChY58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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