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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f5f5295055c90d3ae7232faf37d077261ab2e767f2c3b514500f44050c5cc9' 
  AND token = 'PHNT5p/UFhd8bM2Y/7ORnQ3WTBaBa7T3xba+JnP1pBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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