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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229bce6c293e264143a25a6371b0852b3c2a0412fd36ce9585a41d72504066a3' 
  AND token = 'SH2C8fcFhgCzw8rtoXGgljC9BPEoEMIWC+YU0BAbS9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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