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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570367f767095d2bdf3f13c3fa3cbbf940d5db0cc517c844a965d3f3b6ec8cb8' 
  AND token = 'HtWYAuDnqe+ehKCWUTWgnn3uB9KpfcxSHEX/ZkaZ2Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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